cloud-fan commented on code in PR #36850:
URL: https://github.com/apache/spark/pull/36850#discussion_r902241229
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
##########
@@ -1502,19 +1502,47 @@ object EliminateSorts extends Rule[LogicalPlan] {
* Removes filters that can be evaluated trivially. This can be done through
the following ways:
* 1) by eliding the filter for cases where it will always evaluate to `true`.
* 2) by substituting a dummy empty relation when the filter will always
evaluate to `false`.
- * 3) by eliminating the always-true conditions given the constraints on the
child's output.
+ * 3) by pushing EqualTo with Literal to other conditions.
+ * 4) by eliminating the always-true conditions given the constraints on the
child's output.
*/
object PruneFilters extends Rule[LogicalPlan] with PredicateHelper {
def apply(plan: LogicalPlan): LogicalPlan = plan.transformWithPruning(
_.containsPattern(FILTER), ruleId) {
// If the filter condition always evaluate to true, remove the filter.
- case Filter(Literal(true, BooleanType), child) => child
+ case Filter(Literal.TrueLiteral, child) => child
// If the filter condition always evaluate to null or false,
// replace the input with an empty relation.
case Filter(Literal(null, _), child) =>
LocalRelation(child.output, data = Seq.empty, isStreaming =
plan.isStreaming)
- case Filter(Literal(false, BooleanType), child) =>
+ case Filter(Literal.FalseLiteral, child) =>
LocalRelation(child.output, data = Seq.empty, isStreaming =
plan.isStreaming)
+ case f @ Filter(condition, _: LeafNode) =>
+ val predicates = splitConjunctivePredicates(condition)
+ val equalToWithLiterals = predicates.collect {
+ case eq @ EqualTo(a: Attribute, l: Literal) => eq -> (a -> l)
+ case eq @ EqualTo(l: Literal, a: Attribute) => eq -> (a -> l)
+ }
+ if (equalToWithLiterals.nonEmpty) {
+ val defaultEqualKeyValues = AttributeMap(equalToWithLiterals.map(_._2))
+ val newCondition = predicates.map {
+ // Don't push to IsNotNull because InferFiltersFromConstraints may
infer another IsNotNull
+ case isNotNull: IsNotNull => isNotNull
+ // Exclude the current EqualTo, and push. e.g.: a = 1 and a = 2 ==>
2 = 1 and 1 = 2
Review Comment:
can you explain the high-level idea? are you trying to detect conflicting
equal to predicates and turn them into false literal?
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
